PHP While Loops Easy Questions and Answers

What will be the output of the following PHP code ?

<?php
$m = 8;
while (--$m > 0 || ++$m)
{   
    print $m;
}
?>

As it is || operator the second expression is not evaluated till m becomes 1 then it goes into a loop.

What will be the output of the following PHP code ?

<?php
$n = 1;
while(++$n || --$n)
{   
    print $n;
}
?>

As it is || operator the second expression is not evaluated and n is always incremented, in the first case to 1.

What will be the output of the following PHP code ?

<?php
$num = 0;
while (++$num && --$num)
{   
    print $num;
}
?>

The first condition itself fails thus the loop exists.

What will be the output of the following PHP code ?

<?php
$t = 0;
while ((--$t > ++$t) - 1)
{   
    print $t;
}
?>

(–$t > ++$t) evaluates to 0 but -1 makes it enters the loop and prints t.

What will be the output of the following PHP code ?

<?php
$number = 5;
while (++$number)
{   
    while ($number --> 0)
        print $number;
}
?>

The loop ends when number becomes 0.